https://www.cnet.com/health/at-home-covid-tests-where-can-you-find-them/
For those without insurance, Biden says there will be "thousands of locations" where you can pick up COVID-19 test kits. You'll be able to take the kit home to test in private, rather than get swabbed in a drive-thru clinic. A website will be made available early in 2022 where anyone can order free rapid COVID test kits delivered to their home.
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If you take an at-home test and the results are positive for COVID-19, it's recommended that you turn your results in to your health care provider. Local health departments are also asking people who test positive at home to report their results so they can track COVID-19 outbreaks. Methods of reporting self tests vary wildly -- some health departments have online forms, others require email and still others use phone reporting. Check your local health department's website for specific info on how to report a positive result.
You should stay home and isolate for at least five days or longer if you're symptomatic, according to new recommendations from the CDC. Though the risk of false-positive results from rapid tests is low, most medical experts and health officials still recommend confirming a positive at-home test with a subsequent PCR test.
PS
有些州已经开始了寄送免费测试盒
https://www.nwahomepage.com/news/around-the-region/missouri-will-send-you-a-free-covid-test/